These EQT shoes make a nod to the original, while mixing in two 21st-century adidas technologies: a seamless Primeknit upper and a boost? midsole. Breathable and flexible adidas Primeknit upper for an enhanced fit. Boost?'s energy-returning properties keep every step charged with an endless supply of light, fast energy. Two-layer tongue; Suede tongue label with Trefoil logo. Synthetic side panels; Moulded heel stabiliser. Leather heel strap with debossed linear Trefoil logo. Webbed rubber outsole with Trefoil insert.